This is a blog mostly about techie things, what I am doing to my apartment network on the cheap, IOT, 3D Printing, Raspberry Pis, Arduinos, ESP32, ESP8266, Home Automation, Personal Weather Stations, Things That Go Bump in the Night, and some side issues that need discussing. Remember, sometimes the journey to an end is as much fun as the goal achieved!
Thursday, July 11, 2013
Electronic Diagram for Portion of Slice 2x2
I decided to put up a portion of the slice electronic diagram to show the connections between the RPi, the MCP23017s, and the RGB LEDs. This is a 2x2 RGB LED circuit, which in turn is one fourth the size of the 4x4 test slice that I have been using. The main thing to note is that this is scalable. At each level of the slice, the anodes of the LEDs are tied together, in each column, the Reds are tied together, etc for the LEDs. There is one PNP transistor per level to allow current through and there are three NPN transistors per column to control Red / Green / Blue respectively.
